A new electron cyclotron resonance ion source (ECRIS) was constructed at the NSCL/MSU to replace the existing SC-ECRIS. This ECRIS operates at 18+14.5 GHz microwave frequencies with a planned upgrade to 24-28 GHz in the second phase of commissioning. A superconducting hexapole coil system produce the radial magnetic field; the axial trapping is produced with six superconducting solenoid coils enclosed in an iron yoke to allow the optimization of the distance between the plasma electrode and the resonant zone in the plasma. We report the details of the design, construction, and initial commissioning results of this new ECRIS.

A status report of the design and fabrication of a new, fully superconducting electron cyclotron resonance ion source will be presented. The Superconducting Source for Ions (SuSI) first will operate at 18+14.5GHz microwave frequencies. A short description of the magnet structure and the injection and extraction hardware will be presented. Several innovative solutions are described, which will allow maximum flexibility in tuning SuSI in order to match the acceptance of the coupled cyclotrons. Details of an ultrahigh temperature inductive oven construction are given as well as a description of the low-energy beam transport line.

In 2008, Michigan State University was selected to establish the Facility for Rare Isotope Beams (FRIB). Construction of the FRIB accelerator was completed in January 2022. Phased accelerator commissioning with heavy ion beams started in 2017 with the normal-conducting ion source and radio-frequency quadrupole. In April 2021, the full FRIB driver linear accelerator (linac) was commissioned, with heavy ion beams accelerated to energies above 200 MeV/nucleon by 324 superconducting radiofrequency (SRF) resonators operating at 2 K and 4 K with liquid-helium cooling. In preparation for high-power operation, a liquid lithium charge stripper was commissioned with heavy ion beams up to uranium-238, followed by the simultaneous acceleration of multiple-charge-state heavy ion beams to energies above 200 MeV/nucleon. In December 2021, selenium-84 was produced with the FRIB target using a krypton-86 primary beam, demonstrating FRIB’s capability for scientific discovery.

A new superconducting ECR ion source operating at 18 + 14.5 GHz microwave frequencies has been designed and is presently being constructed at the National Superconducting Cyclotron Laboratory at Michigan State University. The magnet system consists of a sextupole magnet assembly surrounded by 6 solenoid coils. Using more solenoid coils gives the ability to adjust the minimum magnetic field as well as vary the position of the axial fields at injection and extraction. The sextupole coils are confined within the solenoid bobbin using the inflated bladder technique. Coil winding and individual coil tests have been completed as well as assembly of the magnetic components. Because the sextupole is the most challenging part of the project, due to the high magnetic fields and large forces, each individual coil was tested to current densities well beyond what are required for actual operation. Testing of the completed magnet system was done in a test Dewar prior to completing the LHe vessel and continuing with cryostat construction. Magnet fabrication, assembly, and testing results will be presented.